// Note: The main reason there is no OpenReadText is there is no easy way to query for EOF.
// It might be nice to not have to read large text files all at once, ie. via File::ReadLines,
// but OTOH if you are reading files that are THAT big Pebble may not be best tool for
// the job. If there is enough demand for it can add it later.
public static void Register(Engine engine)
{
//@ class Stream
// Note that it is intentional that there is no OpenReadText method. It's easier to use
// the File library for reading text.
TypeDef_Class ourType = TypeFactory.GetTypeDef_Class("Stream", null, false);
ClassDef classDef = engine.defaultContext.CreateClass("Stream", ourType, null, null, false);
classDef.childAllocator = () => {
return(new PebbleStreamHelper());
};
classDef.Initialize();
//@ bool Close()
// Closes the stream.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.Close());
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
}, eval, false);
classDef.AddMemberLiteral("Close", newValue.valType, newValue, false);
}
//@ bool IsReading()
// Return true iff the stream is open in read mode.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.IsReading());
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
}, eval, false);
classDef.AddMemberLiteral("IsReading", newValue.valType, newValue, false);
}
//@ bool IsWriting()
// Returns true iff the stream is open in write mode.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.IsWriting());
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
}, eval, false);
classDef.AddMemberLiteral("IsWriting", newValue.valType, newValue, false);
}
//@ bool IsOpen()
// Returs true iff the stream is open in either read or write mode.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.IsOpen());
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
}, eval, false);
classDef.AddMemberLiteral("IsOpen", newValue.valType, newValue, false);
}
//@ bool OpenReadBinary(string filepath)
// Opens the specified file for reading in binary mode.
// Returns false if there is an error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = args[0] as string;
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.OpenFileRead(context, path));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, true);
classDef.AddMemberLiteral("OpenReadBinary", newValue.valType, newValue, false);
}
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = args[0] as string;
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.OpenFileWrite(context, path, false));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, true);
classDef.AddMemberLiteral("OpenWriteBinary", newValue.valType, newValue, false);
}
//@ bool OpenWriteText(string filepath)
// Opens the specified file for writing in text mode.
// Returns false if there is an error.
{
FunctionValue_Host.EvaluateDelegate eval = (context, args, thisScope) => {
string path = args[0] as string;
PebbleStreamHelper helper = thisScope as PebbleStreamHelper;
return(helper.OpenFileWrite(context, path, true));
};
FunctionValue newValue = new FunctionValue_Host(IntrinsicTypeDefs.BOOL, new ArgList {
IntrinsicTypeDefs.STRING
}, eval, true);
classDef.AddMemberLiteral("OpenWriteText", newValue.valType, newValue, false);
}
classDef.FinalizeClass(engine.defaultContext);
UnitTests.testFuncDelegates.Add("StreamLib", RunTests);
}
/*
* public override string ToString() {
* string argString = "ARGS";
* return (_isConst ? "const " : "") + "<" + retType + "(" + argString + ")>";
* }
*/
public override ITypeDef Resolve(ExecContext context, ref bool error)
{
ITypeDef retValType = retType.Resolve(context, ref error);
if (null == retValType)
{
context.engine.LogCompileError(ParseErrorType.TypeNotFound, "Type '" + retType + "' not found.");
error = true;
return(null);
}
if (null != argHasDefaults && argHasDefaults.Count < argTypes.Count)
{
context.engine.LogCompileError(ParseErrorType.DefaultArgGap, "An argument with a default value is followed by an argument without one.");
error = true;
return(null);
}
int minArgs = argTypes.Count;
if (null != argHasDefaults)
{
int firstDefault = -1;
for (int ii = 0; ii < argHasDefaults.Count; ++ii)
{
if (argHasDefaults[ii])
{
if (firstDefault < 0)
{
firstDefault = ii;
minArgs = ii;
}
}
else if (firstDefault >= 0)
{
context.engine.LogCompileError(ParseErrorType.DefaultArgGap, "An argument with a default value is followed by an argument without one.");
error = true;
return(null);
}
}
}
List <ITypeDef> argValTypes = new List <ITypeDef>();
for (int ii = 0; ii < argTypes.Count; ++ii)
{
ITypeDef argValType = argTypes[ii].Resolve(context, ref error);
if (null == argValType)
{
context.engine.LogCompileError(ParseErrorType.TypeNotFound, "Type '" + argTypes[ii] + "' not found.");
error = true;
return(null);
}
argValTypes.Add(argValType);
}
TypeDef_Class classType = null;
if (null != className)
{
ClassDef classDef = context.GetClass(className);
if (null == classDef)
{
Pb.Assert(false, "Internal error: error resolving class type.");
}
classType = classDef.typeDef;
}
var ret = TypeFactory.GetTypeDef_Function(retValType, argValTypes, minArgs, varArgs, classType, _isConst, false);
return(ret);
}